Learn the Secrets From 'Beyond the Wall'

Featuring exclusive interviews and unparalleled access to the Game of Thrones set, the seven-part series The Game Revealed takes fans inside the biggest and best moments of Season 7. If you haven’t started yet, check out part one — no HBO subscription required — then head to HBO NOW to catch up on The Game Revealed: Episode 2, Episode 3, Episode 4and Episode 5. Find out below what to expect from the sixth installment from the behind-the-scenes series.

From sets and locations to monsters and battle sequences, The Game Revealed: Episode 6 takes viewers through the intricacies of making the unbelievable seem real. Stunt coordinator Rowley Irlam walks through the challenges of working with a zombie polar bear or an army of wights; while VFX supervisor Steve Kullback, producer Christopher Newman and art director Deborah Riley detail exactly how they seamlessly blended Icelandic vistas with 11,000 square-feet of concrete modeled to look like a frozen lake.

This 15-minute piece is rounded out with commentary from episode director Alan Taylor, and actors Rory McCann (The Hound), Kristofer Hivju (Tormund Giantsbane), Kit Harington (Jon Snow) and Emilia Clarke (Daenerys Targaryen), who get into the emotional and physical stakes of Season 7’s penultimate episode.

Check out the clip below, then head to HBO NOW to watch the full episode of Game Revealed: Episode 6.